Sluice gate



Dec. 14,1926 1,611,090"

I E. C. B WALTON SLUICE GATE Filed Dec. 13, 1922 2 Sheets-Sheet 1 v five/afar 8 a cam,

' Dec. 14 1926.

E. C. B WALTON SLUICE GATE] Filed Des. 13, 1922 2 Sheets-Sheet 2,

- I l/weman I HG/62W hwithiwater as free' as possible fromsiltf E310 CHARLES 'BENDYSHE WALTON; oF B oMBAY, INDIAi sLUicE GATE: l [Applieatipfi fi1ed-Deee1iiber 13, IQQQIS eri aI NoQ G O Q G' YQand Iiidia heeemb er g g- 921 :2 I

' This ih entioh relates to sluice, gates erweirs andlmore' o maieularly: to those em j. ployedffor' the purpose of supplying afoa'nal Hitherto' attempts-have been made 1 to exolude'silt by employinga risingzandj falling: sluiceover the top ofwhioh the ater fio sj] 'lhese 'gates ihave be'eii to'fsome eiteiitf'suojcessi'ul in excluding siltbut have the' disadyantage .thatjthey ihave 'a bad i coefficient of. discharge ai dj cause cohsiderahleiafflu x,

that is difierence level between the upstreamr and I. downstream Water, the down streamklevelor theiilei eljin the canal being o'oiisiderably lower than the upstream level or thatofthesourceof supply To obtain the desired disoharge therefore, it is neoessary either to ooi striiot the: canal at a lower level or to keep source at a higher level than woiilchothertiise be necessary, as for example ih the ease of a lriver, byflinoreasihg 'theheight of thei' dani or sluioes' across. it. It has been fojiiiid'that the employment. ofbroad Crested weirs tends, to improve the conditionsof disehargefin'many eases owirigto the faotsthat eddy losses reduoed and that under certain conditions during zfloods' .Ull

the gate beingvertically adjustable-mid the,

oftheheight'oii gatemember. Breferab lyfm addition to}; such downstream flap an upstream gulde' such .weir s o ause little or no e-111;.

. ,The: obj'eot oftheresent: lnventio'n istoprovide an improved forrri of broad crested 5 "weir inj whieh .th e'a'tflux isredueed to minimum While the; orestJ is" rhai fizainedv at such a height to exclude silt-as; tar as possible, thus considerably" improving the the gateyor Well f.

conditions governing thedlsoharge fiowfp'ast According to this inveiltioii the sliiieefgate" tending therefrom on the downstream side,

"inclination of thedownstreamffiap remaining substantially lconstant and independent the, crest or top of the lower shirt-ace is employed provided with rheails for theheight. of the orest 7 adj usting .if'witl suohn arrangemeijit the crest may v be maintained at a 'IIl'L L C-h: higher level t'haii,

"would be the oaselwithfavertioalsluice gate gigging an equivalent discharge. through the fsamow dth fi-"vpp lg s 1? h-1 71011811 downstream guide suria'oe orfiap preferably ts inclination in accordance with z i C ifih S" two; fl ps hii ig to e h the hinge "edshaped *asjtbjiqr .a smooth :and pract cally continuous surface with the; Surfaces. of the ftwo flaps; The V l flaps" are so disposed that the hinge forms the'orest ofthe weir and to prod'u'e a comparatively broad crest" theh-iln'ge is made of large diameter; I The" upstream flaplji's ivoted. at its lower end tea-"support i'n'th'e 7 floor oftheehannel, iand thecre'st is raised or lowered by rotation about. thisgpivot; Any. suitable raisingor lowering meehanisni.

may-"be employed. Thedownstrearn fiapis maintainedjat aisilbstantially oonstant in-] 7 clination which is in'dependent of theheight of the erest; ,Slop'es between 1111 3 and l,

results. The inclination "may be kept prac tieally; constant? i111 an suitable. 'man'neifas 1 for exainple by means of va: parallel linkage, or by .p'rovi ding fourved,guides, in the Walls ofthe ohannelin Whioh'run projeotiohs frorh Q thesi de's' f the flap, orby suitable supportring ropes,ohains or the like.

,The: .best disohargeoonditions are obta iherl bears a definite relation [8'5 when "the, leiigth' "of .the 'jdownstream flap j to the depth of we ter passing the crest, The lengthfof the arid 2H, Where H starids for the depth ater passingthe orestis a maXimumfa' id level,- the] loliger le gthsl being preferable -downstreani. flap preferably lies between =j i [the-crest is, at its highest no'rmal orking '95 iwherecthef gate is required to Y'Work with a small head of less than H and theshort-p er lengths-being preferable where the gate is orilyfreqiiired to'workwith oomparativ'ely;

large heads o a d greater. It would hot, however,' be convenient in practice-to 1 V vary the length of the. flap When the'fl'ow of t anages, andthis lengthis therefore so: llohosen that tinder the eonditions prevailing 7 when thema'ximiim disoharge is rieeded this" rulejis satisfiedflfwheh thev gdisfoh'arge is less "i ie d r olume y 1: 8 'm i iby loitering Ytheh ight Lof the; orest' tomthe re quired-eiit'entgi. This move eht ot. the ores may be effected automatieally v it de's'i'red,

as for example by employing float-operated ra1smg and lowering mechanism. Some preferred construct1ons illustrating -the application of the invention in various circumstances are shown diagrammatically by way of example in the accompanying drawings, in which Figures 1' and 2 are respectively a vertical I section and a plan showingthe application of the present invention to an existing gate ot'known type. V

Figure 3'is a modification applicableto the construction of anew gate.

1 Figure-.4-shows another modification.

igure 5 isa view showing details of one form of mechanism. which maybe employed with a sluice ate accordingto the present 0 invention, and y I Figures6 and 7 show details of the hinges employed in the construction shown in Figured" M- f Like reference letters and numerals refer to like parts in the various figures.

it In Figures 1 and'2, which show the apphcation of the invention to a known type of gate, the river or upstream sideoithe sluice is shown at A and the canal 'or downstream side at B. In the construction ishown the sluice consists. 'ofan upper gate 1. and a lowerfgate 2, ofwhichthe latter, when inl1ts lowered'pos1t1o'n, rests behmd a permanent masonry block S. The gates are formed by girders 4 carrying a skin plate 5, and their ends slide in guides 6 inthe' piers 7 ofthe headworks.

Whenit is desired to take in water past the sluice and at the same timeto exclude silt, the lower gate2 is raised to the position shown in Figure 1. An upstream flap 10 1s hinged at 11 to the 'top of the lower gate;

2. The'other end of this fiap slides on a sill 1'2 suitably disposed in the masonry on the floor of the channel.

On the downstream f side'oif the gate is mounted a second flap 13.; This downstre'am' fiap' li; maybe fixed tothe lower gate 2 or maybe hinged thereto as at 14 so that its inclination may be adjusted through a small 'angle as" may be desired. Thus when the lower gate 2 is in its-lowermost position, the upstream flap 10 will lie substantially horizontally, while the downstream flap 13 will lie at the de sired'angle as indicated at 13 The flap 13 maybe maintained in its correct position by means ofsu1table guides in the piers or'by supporting tackle or otherfmeansr f, f vVhen the" lower gate. 2 is raised to exclude silt,'for. example by means of tackle Q 2 ,.the upstream flapv will be drawn up into the position shownln'Figure 1 so as toform an upstream approach whichwillguide the water smoothlyand. evenly over the top of" the gate. The downstream. fiapj13 will also, conform to themovement o fthe lower gate I its outer edge 15 -being supported by highest position so as to altogether, the side edges of the upstream tackle 18 or other means in such a manner" as to maintain the desired inclination. The provision of ropes or other-raising means for theffiap 13 may, however, be found de- "sirabl'e in any case to allow of slight adjustments in its inclination;irrespective of the height or the lower gate 2, whereby the correct inclination may be obtained to effect the desired discharge. s i

The outer edge 15 ofthe skin plate of the downstream: flap 13 may be extended and suitably curved oil" as shown at 16 further o to reduce eddy losses, or, if found desirable, the edge of the skinplate may be curved up slightly so as to'modii'y the position of the standing wave C, thus 'varyingth'e coeliicient of discharge. 1

"When the lower gateQ is raised to its close the sluice downstream flaps 1.0 and l3'to'gether. This member may takethe' form of, a heavy sill or plate or may merely be a hingeot' large diameter connecting the two flaps.

l'he raising andlowering mechanism acts -on the crest member 18, which w1ll abut against. the upper gate '1 completely'toclose the channel. Alternatively the" arrange ment maybe such that the crest member can beraised high enough to close the channel, without being provided with an upper gate.

The general arrangement of the sluice is in other respects very similar to that ofthe previous construction, except that the 'masonry'block 3 in 'thefloor of the channel is now: unnecessary; When the gate is raised to. its highest position inthis construction, it is important that leakage should be cut ofiijas far as possible, and means.

may be provided whereby the outer-edge 19 otthis flap'is pressed tightly against the Q sill 12 when the gate 1s raised.

' Figure 5 shows a further modiiicatioirin which thegate is formed as a float orother rigid body 25 havinga suitably shaped upper surface. The body25 is vertically mov able within arecess 26 :in the floorof the channel. If the body '25,. is formed as a float, mechanism such as tackle 25 may be provided by which it maybe held down to thendesired height ormay be adjusted acw cording to the discharge required." When, however, the body '25 is not buoyant or is semi-buoyantraisingand lowering mechanism 25 -oii ordinary type may be employed.

46 space to get-chol'red' up, thus=otlering considerable obstruction to {the lowering of the With this-construction it is possible :that

the recess 26 may gradually get choked up with silt, and to 'prevent this openings 28 and-29 maybe provided respectively in the downstream and'upstream walls of therecess, the-latteropening 29. preferably being valvecontrolled, so that water may be, passed through ,these "openings when desired to flush eoutt-he recess 26.; I a

. The upper surface of the body 25 is formed with two inclined guide surfacessloping away from the crest respectively on the ups,

- -may'abut, so that the channel may-be com- V gate employing a downstream 1iap 13'andv stream and downstream sides.- An upper gate 1 maybe-provided, if desired,- against which the upper surface of the body 25 plet ely closedfor alternatively the arrangement should be such that the body 25 may lo e-raised sufiiciently high to close the channel, r

Figure 5'shows.a simpleform of sluice an upstream flap the crest being formed y the g 15, bymeans of which the two flaps are connected together. -The upstream flap 10 is hinged at I 82 to the floor of the channel and the crest of the gate is raised ori lowered by rotation about this so f a, parallel linlrage formed byithe two flaps hinge. lhe inclination of the downstream flap 13 is maintainedconstant by means of 10 and "13 and links 38, which are connected to the: flap 18 towards its, outer end and are pivotedfat84 .to thefloo'r of'thechannel at such a- .di stance,from the hinge 32, that theyremain substantially parallel to the flap 10 during raising. or: lowering of the gate, It will be noticedithatinthis constructiom' Vas'also in some of the constructions previously described 'there is a space below the flaps whichisopento the downstream water.

Under certainconditions eddies mayaform under the downstream flap 13 as indicated by: the .arrows' in Figure 3', and. these eddies would tend to deposlt siltand cause the gate atllow water levelsrf To prevent this a furtherfiapg35is hinged at 36 to the'o'uter end of the flap 13, the loweredge'ofthisfiap 35Iridingon' the surface of the bed of the channel. The lower edgeof this fiapl35 may be fitted iwith rollers running in suitable guides, if desired, and separate tackle, such as the rope 37 -mayjbe provided by means of whichlit may be raised or lowered 2 The accumulation offsi t under the gate a be further} preyented by sloping the :5 fioor of the downstream channel as at 42, and vby providing 'oneor, more ducts 413 leadingfrom the upstream-Water through.

the side walls of thegate to "an orifice 4:4- under the gate. Water can;thus"be passed V to give access to the undersideof'the gateto facilitate cleaning on repairs.

- necte'd .by a rope or ropes 39. passing over? pulleys 4:0 and/l1, to the upstream flap l0 ously. lowered: to meet it; The: ropesxg39 I this purpose, as for example suitable gear-c ing'for rotating the shaft of the. .hinge"32 into the space i under T the flaps causing an outward flow through any Jopenings :there I may be, to .j-flush voutfithe space below the? gate' 'andthefinlet opening 45 to the duct or ducts may be provided-witha'small sluice or valve and a screenj 1 a T In this construction the u per v'gate mem 1 her isv jit'ormedla's.a'counterweight 38 econ-1 nearthe hingepiil. The channel may be' a completely closed by raising-the"flap -10 about its hinge BQ until; it'fiabutscagainst the counterwe ght .38 vwhich is simultanewhich connect the lower gate'member "to its counterweight 3,8 fmay be employed as rais- V ing and lowering mechanism; or other known" forms offmechanism maybe employed: for

to which the-upstream flap 10 is connected;

It is important that thejhinge 31 between the flaps should 'bepof suchanatureas to give a smooth connecting surface. A convenient type of hinge: is shown in Figure 6. The surface ,plateofthe upstream flap 10' is curved atits upper end e6, so that it has A across section in,the;form of a circular arc. Thesurtace plate ofthe downstream flap.

is then'eXtended to abut tangentiallyas" at 47' againstlthe arc-shaped end-4L6 of the upstream flap, the shaftt8'forming the axis of the hingebeing supported .atthe centre of the arc in suitable :web s- 49 and 5016a]? 9 ried bythe flaps; The hinge inay alsobej 1 formed inthis,menne ii Asomewhat similarlc'ol structioii maybe employed i or the hingeBQ, by which the upstream flap 10 is connected to. a support 51 I in the'floorof the channel.;- In this ca se ra plate. 51- fiXed to the "support may abutagainst the arc-shaped end 52 of the-sun: "face plate ofj the flap 10. Qtl1 61"f0fin$.0f. Y

hinges-may, however be employed if desired.-

I ;.It will-be understood that the constructions described a re given only by way of example J to illustrate [variousapplications ofth'e in? ventionpand the details 'ofjconstruct on may be varied wlthm w de limltswlthout departingfrom the spirit o f the invention.

What I claim as my invention and desire to secureby Letters Patent, is:r V V 1. A" sluice gate or -weir,-- comprising in combinatiomtwo membersfhingedtogether along adjacent edges to form a crest pprtion, the other'edge oi one memberbemgsecured V adiacentfltheflstream. bottom5 and means tori is having a crest portion and an inclined downstream gulde-surface portion extend ing from the crest, means for raising and lowering said structure while maintaining the dowstream guide portion at a substan: tially constant inclination with the horizontal, the length of said guide portion being made between one-half and two times the height of water measured vertically above the crest'when the amount of-water passing is a maximum for 'highest normal working elevationofthe crest,

3. A sluice gate or weir, comprising in combination, a supportmember and a guide member hinged together along adjacent edges to form a crest portion, the .other edge of the support member being secured adiacent the stream bottom, and means for raising and lowering the crest while maintain- 'mg the guide member at a substantially constant inclination, with the horizontal for all 'positions of the crest, the length of said guide member being made between one-half and two times the height of water measured Vertically abovethe crest when the amount of waterspassmg 1s a. maximum for highest normal.working'elevation ofthe crest.

4;. A sluice gate or'weir, including in combination a member: forming the crest, two inclined flaps hinged to the crest'member and extending. therefrom respectively on the upstream and downstream sides, a fixed sup port on the floor of the channel to which the upstream flap is hinged, means for raising and lowering the upstream flap about its hinge, and means for maintaining the in- 7 clination ;of the downstream flap substanr tially constant as set forth. r

5. A sluice gate or weir, ncluding in combination two inclined flaps extending from the crest respectively on the upstream and downstream sides, a hinge connecting the two flaps and forming the crest, a fixed support on the tic-or of the channel to which the upstream'flap is hinged, means for raising and lowering the upstream flapab-out its hinge, and means for maintaining the inclination of" theydowiistr eam flap substantially constant, the length of the downstream flap bearing a'defimterelation to the depth of water flowing over the crest when the .amountof water passing the crest is at its maximum as set forth.

. 6. A sluice gate or weir, including in combination two inclined flaps extending from the crestrespectively on the upstream and downstream sides, a hinge connecting the two flaps and forming the crest, means for l raising and lowering the crest, links hinged to the downstream flap near its ou er edge,

" and fixedsupports on the tloor of the channel 7 a being jsodistanced apart that the links are to which the upstream flap and the links are respectively hinged, these fixed supports set forth.

maintained parallel to the upstream fiapfa s 7. A slul'ce'gate or weir, including in com bination a member forming the crest, two

inclined flaps hinged to thecrest' member and GXtQIlCllIlQ therefrom respectively on the upstream and downstream sides, means for raising and lowering the crest, means for maintaining the inchnation of the downstream flap substantially constant, and a third flap hinged to the outer edge of the downstream flap as setforth.

8. A siuice gate or weir, including in combination two inclined flaps extendingfrom the crest respectively on the upstream and downstream sides; a hinge connecting the two flaps and forming the crest, means for raising and lowering'the crest, links hinged nap hinged to th'e'outer edge of the downstream fiap, a duct leading from the upstream water to the spacebelow the'fiaps,

ising and'lowering the crest, means for ntammg the incl nation of the down stream flap substantially constant, ,a thirdf J3 and a valve cont-rolling the intake opening to this duct as set forth.

o 10. A. sluice gate or weir, including in combination a member forming the crest,

two inclined guide surfaces extending from the crest respectively on the upstream and downstreanr sides, means for {raising and lowerin the crest, a counterweight forming an upper gate member'against which the crest abuts when in its highest position, and

means for maintaining the inclination of the downstream'guide surface substantially con-- stant asset forth. V

11. A. sluice gate or weir,'including in combination two inclined flaps extending fromthe crest respectively on the upstream and do. *nstream sides, a hinge connecting the two flaps and forming the crest, means for raising and lowering the crest, a counter weight forming an upper gate member against which the crest abuts when in its highest positiomand means for maintaining the inclination of the downstream flap substantially constant as set forth.

name to this specification.

talc CHARLES BENDYSHE'WALTON;

7 1 25 In testimony whereof I have signedqmy. 

